step(ci,(r,s),tm(s,[ctxm(beta_1_2_,ci,ip, (ip,ci), (ip,ci)),ctxm(beta_1_2_,r,ip, (ip,r), (ip,r))],pri(lst,[pri(pc,[ctxm(beta_1_2_,dot,s,i_s,c_s),ctxm(beta_1_2_,u,bsn,i_bsn,i_bsn),ctxm(beta_1_2_,r,dom, (dom,r,beta_1_), (dom,r,beta_1_))]),ctxm(beta_1_2_,u,d_1, (i,d_1), (c,d_1)),ctxm(beta_1_2_,u,d_4, (i,d_4), (c,d_4))]))).
